Motor regulator



April 29, 1941. P. RUSEELL 2,239,738

MOTOR REGULATOR Filed April 27, 1957 3067732277. I frey $3155 6112/,

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Patented Apr. 29, 1941 UNITED STATES PATENT OFFICE MOTOR. REGULATOR Percy Russell, Wilmington, Del.

Application April 27,1937, Serial No. 139,121

4 Claims.

This invention relates to motor regulators, and more particularly to pneumatic regulators for electric motors.

In a patent issued May 13, 1924 to E. B. Wilford and P. Russell, No. 1,494,189, there was a disclosure of the broad feature of a pneumatic motor regulator, and the invention herein, in certain regards, may be construed as an improvement thereon.

It is among the objects of this invention; to improve pneumatic motor regulator switches; to provide a pneumatic electric motor regulator as an attachable unit for association with independently assembled motors; to provide a motor regulator switch with control means to vary the regulated speed in accordance with variation in contact setting; to provide an electric motor regulator switch .to start and stop the motor as well as to regulate it during rotation; to improve the details of construction of pneumatic motor regulator switches; and many other objects and advantages as will become more apparent as the description proceeds.

In the accompanying drawing:

The figure represents a form of the invention for motor regulation in elevation, diagrammatically, of general utility in which control is se cured by changing the position of a contact.

It is contemplated that regulation may be accomplished expeditiously by providing a permanent spring setting, if a spring :be used, in the motor regulator switch, with a variable contact so adjusted as to vary the distance through which the vane must travel, as is disclosed in the drawing.

Referring now to the figure, there is disclosed a diagrammatic fragment of a motor housing I52, having an air port I53 communicating at one end with a blower or fan (not shown) and at the other with the interior of a regulator switch housing I54 within which there is pivoted in any preferred manner, a vane I55 held toward the mouth I53 by a spring I56, against the compression of which the vane moves as the force of the air stream in opening I53 increases. The vane carries the contact element I5I. A rod I58, suitably pivoted, as at I60 carries the contact I6I which is adjustable relative to the contact I5I either by the mechanical adjustment afforded by the set screw I62, or by the Bowden control wire I63 guided in the cable I64, and controlled by the trigger I65, by which the contact I6I can be pushed into engagement with the contact I5I against the resistance of spring I66 urging the rod I58 against the stop I62, to start the motor, and also can be used by trigger adjustments to regulate the motor speed. It will be clear that any other desired sort of actuator for the contact control can be used as desired. Any desired actuator using springs is available for adjusting the relatively fixed cont-act in place of the unit or set screw as will be obvious.

It will be understood that the armature within the motor housing I52 drives a fan or blower (not shown) delivering a variable air stream through aperture I53 against vane I55 pushing the latter against the resistance of spring I56. It will be clear that the greater the degree of compression of spring I56 the greater the force necessary to compress it further, so that in moving the vane from the open circuit position shown to that in which the set screw I62 and wire I63 are further retracted under the influence of spring I66, the loading of the spring I56 is consequently augmented or increased in moving contact I5I on vane I55 the increased distance necessary to make contact, with relatively fixed contact I6I consequently requiring a stronger air column and consequently increased fan speed. Conversely moving contact I6I toward contact I5I decreases the distance of vane travel and therefore the spring loading necessary to be overcome by the air colcum and therefore reduces the fan speed necessary toactuate same.

The make and break of the circuit through contacts I5I and I6I controls the motor circuit and is a control of the motor speed, as will be readily understood.

It will be understood that the disclosure herein is purely illustrative and represents but one of the many modifications and changes that can be made in this invention .without departing from the spirit thereof, and such are to be construed as within the scope of this invention unless otherwise positively limited in the appended claims.

I claim:

1. In a switch formotor regulation, avane, means resiliently supporting the vane, a contact on the vane, a relatively fixed contact, said resilient means urging the vane toward contact opening position, and means for adjusting the relatively fixed contact to vary the tension of the resilient means at which the respective cont-acts engage.

2. In switches for motor regulation, a pneumatic regulator comprising contacts controlling a circuit arranged to be automatically made and broken, a trigger-like control, and means connecting the trigger and a contact in said regu- 4. In a switch for motor regulation, a pair or relatively movable contacts, means for manually moving the contacts together to close the circuit, said means arranged to move the contacts apart for opening the circuit, means for resiliently urging one contact from the other, said manual means arranged to vary the position of said other contact to vary the resilient tension with which said separating urge is manifest.

PERCY RUSSELL. 

